HU201391B - Method for producing plastic tubes and setting into existing depressions particularly tubular ducts respectively tubings - Google Patents

Abstract

In this method of laying piping, the shell of a plastic pipe (4) of predetermined stiffness prior to insertion into a recess, e.g. in a pipe, a stiffening material (7) applied in the form of curable synthetic resin. This material cures only after a certain time, i. after the tube (4) has been brought into its desired position, completely and then increases the inherent rigidity of the plastic tube.

The device has means (5, 6, 7) for bringing a stiffening material onto the pipe surface.

Description

BACKGROUND OF THE INVENTION The present invention relates to a method for inserting plastic pipes into existing recesses, in particular pre-fabricated underground tubular channels or existing pipelines.

At present, the technology is known for constructing plastic pipes in cavities, especially underground channels, or lining existing pipes of various diameters with plastic pipes. This can be done, for example, by somehow placing such plastic pipes in the recesses and pushing or pulling them into the pipes. Particularly preferred is a process in which the plastic tube to be inserted or laid is produced at the site of installation, for example by winding it from plastic tape. This winding machine is often placed in a shaft at the height of the breakthrough so that the plastic pipe produced by the winder can be folded into the channel to be lined.

Also known is Dr. Mondvai, "Production and Processing of Polymers". 32 (Tankönyvkóló, 1971, Budapest, p. 32) is a process for making plastic tubes by impregnating roving. or strips of fiberglass are wound onto a rotating core and crosslinked thereon. The disadvantage of the above solution is that the plastic pipe so produced can only be installed after curing, e.g. can be folded into its final mounting position.

Regardless of the technology used to manufacture the plastic pipe and its laying or insertion, the pipe cannot be too rigid if, for example, it is intended to be introduced into a non-straight pathway. Indenting. or insertion of plastic tubing into curved ducts is practically barely feasible with current technology, even if they are made of relatively flexible material and inserted into the duct. However, such pipes have the disadvantage that, when installed, they have insufficient rigidity for the loads to be applied.

This defect has been attempted by complicated mechanisms. e.g. spring tensioning mechanisms. However, the result turned out to be negligible compared to the expenditure.

It is an object of the present invention to overcome the above shortcomings, that is, to provide a solution which, on the one hand, permits the insertion of relatively low stiffness plastic pipes and, on the other hand, provides a subsequent increase in pipe stiffness to the extent required by the application.

This object is solved by further developing the process described above. The process of the present invention consists in making the jacket of the plastic tube in a preselected rigidity by winding plastic tapes, applying a curable hardener to the jacket, inserting the plastic tube into the cavity before hardening the hardener, and subsequently forming the hardener. greater rigidity of the plastic tube compared to the original.

Due to the process according to the invention, a plastic tube with the desired flexibility can be easily introduced into the channel. The stiffness will only increase after a certain time after the previously applied curing agent has hardened.

Preferably, the curing agent is applied to the outer contact surface of the plastic tube.

Optionally, the stabilizer used is a polymerizable plastic with reinforcing pads, such as epoxy resins, which cure after a certain time by the addition of a curing catalyst. However, it is also possible to choose a curing agent which begins to polymerize only by the transmission of heat or by the transmission of electromagnetic waves (light).

A solidifying agent, such as a resin, may first be applied to a carrier, e.g. textile fibers, tapes, fiberglass, or the like, and then wrap it around the plastic tube wrap.

In the latter process, the carrier which has been impregnated with the solidifying agent is preferably moistened with a curing catalyst after it is wound up.

Preferably, the inserted plastic tubes can be provided with circumferential ribs and the curing agent is then applied to the slats between the ribs.

Of course, the curing agent may also be applied to pipe sections projecting out of the duct during tube insertion. This is particularly advantageous where the plastic pipe is manufactured, for example, by a winding process on site, for example, immediately before the installation site.

In a particularly preferred embodiment of the process according to the invention, the material of the plastic tube is a light-permeable plastic material and the hardener is a light-curing material which can be cured by light, such as ultraviolet radiation, after the plastic tube is installed. For this, the light source can be guided through the built-in tube.

The process of the invention will be described in more detail with reference to the accompanying drawings, in which an exemplary embodiment of an apparatus for carrying out the process of the invention is shown. In the drawing:

Figure 1 is a vertical schematic sectional view of a detail of the apparatus:

Figure 2 is a plan view of the apparatus of Figure 1.

As will be seen from the foregoing, the process of the present invention can be used to manufacture and lay a plastic tube by increasing the strength of the plastic tube in its final mounting position.

This is achieved in accordance with the present invention by forming a plastic tube with a prescribed sheath strength by winding it from a plastic tape, which is then practically defined on the outer sheath for a period of time just prior to being inserted or inserted into the lined recess (or after which a hardening curing agent is provided.

This hardener may be applied as a separate layer or in rolls. Advantageously, we can do tape tape! the substrate (textile tape, fiberglass tape, or the like) is coated or impregnated with a curable plastic layer, and the resulting tape is wound onto the periphery of the plastic tube (particularly between the outer ribs of the plastic tube). This resin binds to the plastic tube and hardens, whereby the hardening time depends on the hardener selected, e.g. the curing catalyst added (i.e., type and amount of catalyst).

Especially epoxy resins are used as stabilizers. For example, the resin known commercially as "ARALDITE." These resins are strained after the addition of catalysts (e.g., amine catalysts)

EN 201391 mentes they are made of a plastic-free, high-hardness and impact-resistant plastic with the desired degree of rigidity.

In Figures 1 and 2, the tube winding machine used to carry out the process according to the invention is marked with 1 in its entirety, in which a plastic tape 3 is wound on the inner wall of the drum 2 to form a plastic tube 4. This plastic tube 4 may optionally be provided with outer ring ribs. In this winding tube fabrication process, the longitudinal strip edges are continuously connected to one another, such as by mechanical means (e.g., groove-to-projection connection and / or gluing or welding) known in the art. The plastic tube 4 thus produced leaves the coil drum 2 by means of a mechanical feed and, in this case, is driven directly in the direction of arrow "A" in the pipeline not shown and to be lined.

Immediately after leaving the coil 2, a curing tape 5 having a curing or impregnated support material is wound on the outer circumference of the plastic tube (e. G., Preferably between the outer ring portions of the plastic tube 4). To this end, the carrier webs are passed through a container 6 filled with a liquid solidifying material 7. Thus, in the container 6, the liquid strips are provided with or impregnated with the conveyor belts 5 and then passed through rollers 8 and 9 to the periphery of the plastic tube 4. In the exemplary embodiment shown, four carrier belts 5 are used. The plastic tube 4 rotating about its longitudinal axis in the direction of the arrow automatically pulls off the carrier strips 5, thereby winding the tube casing.

The plastic tube 4 thus secured is then brought into its final mounting position, i.e., laid, or retracted or pressed. The curing of the curing agent is carried out already in the installed position of the plastic tube 4, thereby increasing the self-strength of the plastic tube 4.

It is also possible to spray the solidifying material onto the circumference of the plastic tube 4. In this process, the curable layer adheres to the surface of the plastic tube, cures to it and cures.

As mentioned above, it may be desirable to use a light-transmitting material for the manufacture of the plastic tube 4. This allows the use of a light curing curing agent, so that the curing operation can be easily carried out e.g. by means of a light source inserted into the integrated plastic tube 4.

Claims (12)

PATENT CLAIMS A method for manufacturing plastic pipes and placing them in existing recesses, in particular in underground tubular channels or ducts, wherein the plastic pipe mantle is formed by spirally wounding a web of material, characterized in that it is made of a material, and inserting the plastic tube thus prepared into its final position, the cavity, before the curing agent hardens. Method according to claim I, characterized in that the curing agent layer is applied to the outer peripheral surface of the plastic tube. 3. The l. Process according to Claim 1 or 2, characterized in that the post-cure hardening agent is a polymerizable plastic, in particular an epoxy resin, a polyester resin or a polyester resin modified with a polymethyl methacrylate, optionally provided with a reinforcing insert. The process according to claim 3, characterized in that, after its incorporation into the final position of the plastic tube provided with the curing agent, polymerization of the curing agent is started. which is preferably carried out using heat and / or light radiation and optionally a catalyst. 5. A process according to any one of claims 1 to 3, characterized in that the solidifying agent is first applied to a carrier material, preferably to fibers or tapes and the like, and then is wound on the outer circumference of the plastic tube. 6. A method according to any one of claims 1 to 6. characterized in that a plastic tube with outer ribs, in particular circumferential ribs, is formed and the curing agent is applied to the slats between the ribs. A method according to claim 5, characterized in that the solidified carrier material is wound as a helical layer on the outer periphery of the plastic tube. 8. A method according to any one of claims 1 to 3, characterized in that the plasticizer tube is applied to the plastic tube immediately prior to its insertion or laying. A method according to any one of claims 1-8, characterized in that the plastic tube is formed by a winding process at the installation site, preferably immediately before the installation site, and is then folded into the recess immediately, wherein the curing layer is applied directly to the plastic tube. when exiting the winding machine. 10. Process according to any one of claims 1 to 4, characterized in that the plastic tube is made of a light-transmitting plastic material and a light-curing material as a curing agent which is cured with light, preferably ultraviolet radiation, after the plastic tube has been permanently installed. The method of claim 5, characterized by. impregnating the carrier with the solidifying agent and wetting it with a curing catalyst after winding it onto the plastic tube. 12. A process according to any one of claims 1 to 3, characterized in that the solidifying agent is a water miscible or non-water repellent material.